Combined dash adjustment and primer for carbureters.



0. c. FUNDERBURK.

COMBINED DASH ADJUSTMENT AND PRIMER FOR CARBURETERS.

APPLICATION FILED JUNE 28,1915. 5

1 188383. 7 v Patented May16, 1916.

-2 susers suan 1.

C o v a \X I e 2% 5 @Q URE-i.

HER FOR CARBURETERS.

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7 WW W A a! 11 J 1 M M W a K OTIS C. FUNDERBURK, 013 DETROIT, MICHIGAN, ASSIGNOR TO DETROIT LUBBICATOR COMPANY, OF DETROIT, MICHIGAN, A CORPORATION OF MICHIGAN.

COMBINED DASH'ADJUSTMENT AND PRIMER FOR CARBURETERS.

' bined Dash Adjustments andPrimers for I "Carbureters, of which the following is a specification, reference being had therein to the accompanying drawings.

It is the object of the invention to obtain an adjustment for carbureters by which compensation may be made .for variations due to temperature conditions, variation in load, etc., and in which an adjustment suitable for one speed is equally suitable'for other speeds.

A further object is to obtain this result with a simple construction and one which performs the further function at a primer.

In the drawings: Figure 1 is a plan View of a carbureterto which my improvements are applied; Fig. 2 isan enlarged vertical section; F ig.- 3 isa cross section on the line 22 of Fig. l; and Fig. 4 is a cross-section on the line y-y of Fig. l.

In the operation of engines under varying conditions:of temperature and load, it is frequently desirable to adjust the flow of the liquid fuel. Thus, in starting. with a cold engine, the increased viscosity of the oil, as well-as thepgreater difficulty in va-.

porizing the same, requires an increased.

area of supply, and the same is true where the engine is running under increased load. On the other hand, a carbureter must respond to variations in speed of the engine, and as heretofore constructed it has been difiicult to obtain any adjustment which would operate proportionately at different speeds. 1

With my improved constructlon I have overcome the difi'iculty by an auxiliary supply of the liquid fuel, which when, adjusted to produce an increased fiow at gne speed will also produce a proportionate increase in the flow at, different speeds, -tl1e c.031- struction being as follows: p

A is the mixing chamber ofa carbureter controlled by a throttle valve B, and provided with suitable means for obtaining proortionate volumes of air and-liquid fuel in different positions of adjustment of the throttle. As shown, this proportionate means-comprises avalve G controlling the Specification of Letters Patent.

' Patented May 16, 1916.

such as the rack G and coiiperating pinion.

H, but this adjustment when once properly set to produce a desired proportion at different speeds cannot be changed without disturbance in the ratio. provided means for supplying additional liquid fuel which is dependent upon the I have therefore.

velocity of the air passing through the carbureter, and is independent of the adjustment of the main metering pin. This auxiliary means preferably comprises a passage I for auxiliary Oll, which is controlled by a needle-valve or metering pin J, and which is preferably located at one side of the air inlet conduit. This passage leads to an oil discharge nozzle K, which is arranged in; the air lnlet passage, so that the air drawn over the end of the nozzle will produce the requisite suction for the discharge of the oil. The quantity discharged will be regulated, first, by the restriction of the metering pin, and second, by the velocity of the air, and thus when an adjustment is made for one speed a proportionate discharge will be obtained at a changed speed; a

As specifically shown, the needle valve J.

is located in a bore or cylindrical chamber L, and the stem J of the valve has arranged thereon a piston J which fits within said cylinder. Above this piston J there is a passage NI which leads from the cylinderL to the mixingchamber. There is also an air vent M connecting with the cylinder above the passage M. N is a spring sleeved on thestem J, one end abutting against the piston J and the other end against a gland or cap 0 through which the stem passes out from the cylinder. 1 P is a? lever engaging a collar Q, having a threaded engagement with the stem, and R is acam upon a shaft j S Which'is adapted to raise and lower the Y lever P, thereby correspondingly raising and lowering the stem J The shaft S extends to the dash or other convenient position for adjustment.

' With the construction as described, to ad just the 'carbureter for any abnormal condition, as for instance where the engine iscold,

the shaft S is rotated to 'operatethe cam R,

extent, which will open a free passage from the oil Supply I to the cylinder L, and will also raise the piston J above the port M and between the same and the vent port M,

This will establish communication between the mixing chamber and the cylinder L, so that the suction of said mixing chamber Will raise the oil in the cylinder and discharge it directly through the passage M into the mixing chamber, thereby" priming the carburetor.

If instead of priming it is merely desired to increase the flow of oil, thccam R is ad justed so as to raise the stem J to a lesser degree, where the piston J will be below the passage M. Thel-oil will thus be permitted to pass from the supply conduit I to the passage I and to the nozzle K, where the suction produced by the velocity of the air current across the end of said nozzle will the heedle valve J, which operates as a me tering pin, and it will also be proportionate 3,0

lift the oil and discharge it into the air current. The quantity thus "discharged will be, regulated by the degree of opening of to the velocity of the air passing the nozzle K. Thus when an adjustment is made for one speed it will be suitable for every other speed, as the quantity of oil discharged will be proportionate to thevelocity of air. It will be understood that this auxiliary oil supply does not interfere in any way with the operation of the main discharge nozzle of the carbureter, but is merely supplemental thereto. As a consequence the auxiliary device may be cut out completely by the closing of the valve J, and the carbureter will. operate by the discharge of oil. from the main" nozzle. Under this condition oil is prevented from discharging through the passage M by reason of the fact that the vent port M neutralizes the suction fro-m the mixing chamber and air only will pass through the passage M.

What I claim as my invention is i 1. In a carbureter having an induction 'conduitand a liquid fuel inlet, of regulable l l I,

valve, of a fuel nozzle in said air induction conduit in advance of said mixing chamber and valve, and means for variably restricting the supply of fuel to the latter nozzle.

3. In a carbureter, the combination with a mixing chamber, an induction conduit and a fuel supply nozzle, of automatic means controlling and proportioning the admission of air and fuel from said conduit and nozzle to the mixing chamber, a, liquid fuel discharge nozzle in said induction conduit in advance of the mixing chamber, and manually operable means for controlling the discharge of fuel from the last-mentioned nozzle. r

4. In a carbureter, the combination with a mixing chamber and a main fuel supply nozzle, of automatic means controlling and proportioning the admission of air to said chamber and liquid fuel to said nozzle, and auxiliary'fuel supply nozzle located in the induction conduit in advance of said mixing chamber, and manually operable means for yariably restricting the supply to said auxiliary nozzle.

5. In av carbureter, the combination with a mixing chamber and automatic means for controlling and proportionin the admis sion of air and liquid fuel, or an auxiliary fuel nozzle located in the induction conduit in advance of said mixing chamber and subjected to the ejector effect of the passing air, means for variably restricting the fuel supply to said nozzle, means for establishlishing a direct fuel discharge passage to said mixing chamber, and manually oper-- able means for alternatively controlling said variable restriction and said direct fuel discharge passage.

=6. In a carburetor, the combination with a mixing chamber, of means for controlling and proportioning the admission of air and fuelthereinto, including, an automatic air valve au auxiliary fuel discharge passage leading into said mixing chamber, means for venting-said passage abov'e'the normal level of the liquid fuel, whereby air is normally discharged therethrough, and man' v ually operable means for closingsaidvent' to cause the discharge of liquid fuel.

7. In a carbureter, the combinationwith a mixing chamber, an automatic valve in the air inlet thereto and means controlledby said valve for controlling the supply of liquid fuel, of a combined'primer and auxil' iary fuel supply, comprising a nozzle in the air induction conduitjii advance 6f said, valve, a fuel supply passage leadingto said mixing chamber, vented above the normal level of the fuel to normally discharge air;

only therethrough, and manually operable means for alternatively establishing restrict ed communication between the liquid fuel supply and said auxiliary nozzle and for closing said vent.

8. In a carburetor, the combination With the mixing chamber, an air inlet passage thereinto, ling the admission of fuel to said chamber, of an auxiliary fuel supply comprising a discharge nozzle'in the air inlet passage, a passage connecting withsaid mixing chamber, a common liquid fuel supply for said nozzle and passage, a vent for said passage above the normal level of the oil, a manually operable valve'controlling the supply to said nozzle and passage for yariably restricting the connection with the former, said valve being adapted in one position of adjustment 7 to cut-off said vent and open an unrestricted supply to said passage.

In a carburetor, the combination with the mixing chamber,- of an automatic valve in the air inlet thereto controlling the normal supply of liquid fuel, and an auxiliary fuel supply comprising a cylindrical chamer having a fuel supply port at one end thereof, a. valve stem in said chamber having a metering pin controlling said port and a piston for dividing said chamber into two compartments, a discharge nozzle connecting with the compartment of said chamber adjacent to said supply port, said nozzle being located in the air induction passage, a channel connecting with said chamber above the normal position of said piston and leading to said mixing chamber, a vent for said cylindrical chamber normally on the same side of said piston as said passage leading to the m'ixmg chamber, said piston being adapted to be adjusted to establish direct communication between the fuel supply port and said passage leading to the mixing chamber, and to cut-off said vent.

10. In a carbureter, the combination with a mixing chamber, an air inlet passage and an automatic valve therebetween' controlling the supply of liquid fuel thereto, of an auxiliary fuel supply comprising a nozzle in said inlet passage, a fuel passage leading to said mixing chamber, a cylindrical chamber with which said nozzle and fuel passage connect, a valve having a metering pin for regulating the supply of fuel to said cham;

her and also having a piston normally in a position to cut-off said passage leading to I the mixing chamber, an aii' vent also connecting with said cylindrical chamber, and manually operable means for adjusting said valve to vary pin and alternatively to move said piston bctween'said passage leading to the mixing chamber and said vent. I

11. In a carburetor, the combination with a casing containing the mixing chamber, an air inlet passage and fuel supply passag an automatic air, valve control-- the position of said metering I of an automatic valve in said air inlet passage for controlling the normal supply of fuel to said mixing chamber, and an ad justable auxiliary fuel supply comprising a cylindrical'chamber in the wall of said casmg, having a fuel supply port at one end and a valve stem passing out from the opposite end, a metering pin on said valve stem for variably restricting said supply port,-a piston on said stem for dividing said chamber into two compartments, a nozzle in said air inlet passage communicating with said cylindrical chamber in the compartment adjacent to the oil supply, a passage connecting with said chamber in the compartment normaly on the opposite side of said piston and leading to said mixing chamber, an air vent for said chamber, and

manually-operable means for adjusting said stem to vary the metering of'the fuel, also adapted to shift said piston to the oppositr side of said passage leading to the mixing chamber, thereby establishing unrestricted communication with the oil supplyand cutting off said vent.

12. In a carburetor, the combination with a mixing chamber and an air supply chamber, of means automatically controlling and proportioning the admission of air and liquid fuel to the, mixing chamber, and means for alternatively supplying auxiliary fuel directly to the mixing chamber or to the. air supply-chamber.

13. In a carburetor, the combination with a mix ng chamber and an air supply chamber, of'means automatically controlling and 15. In a""carbureter, the combination with a mixing chamber and an air supply cham her, a nozzle for discharging liquid fuel into the mixing chamber, an automatic valve controlling admission of air from said air chamber to said mixing chamber, metering means for the liquid fuel controlled by said nozzle, of means within said air chamber for supplying additional fuel.

In testimony whereof I a ffix my s igna'ture.

OTIS C. FUNDERBURIL, 

